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/*
* Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_SERVICES_HEAPDUMPER_HPP
#define SHARE_SERVICES_HEAPDUMPER_HPP
#include "memory/allocation.hpp"
#include "oops/oop.hpp"
#include "runtime/os.hpp"
// HeapDumper is used to dump the java heap to file in HPROF binary format:
//
// { HeapDumper dumper(true /* full GC before heap dump */);
// if (dumper.dump("/export/java.hprof")) {
// ResourceMark rm;
// tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
// } else {
// // dump succeeded
// }
// }
//
class outputStream;
class HeapDumper : public StackObj {
private:
char* _error;
bool _gc_before_heap_dump;
bool _oome;
elapsedTimer _t;
HeapDumper(bool gc_before_heap_dump, bool oome) :
_error(NULL), _gc_before_heap_dump(gc_before_heap_dump), _oome(oome) { }
// string representation of error
char* error() const { return _error; }
void set_error(char const* error);
// internal timer.
elapsedTimer* timer() { return &_t; }
static void dump_heap(bool oome);
public:
HeapDumper(bool gc_before_heap_dump) :
_error(NULL), _gc_before_heap_dump(gc_before_heap_dump), _oome(false) { }
~HeapDumper();
// dumps the heap to the specified file, returns 0 if success.
// additional info is written to out if not NULL.
// compression >= 0 creates a gzipped file with the given compression level.
// parallel_thread_num >= 0 indicates thread numbers of parallel object dump
int dump(const char* path, outputStream* out = NULL, int compression = -1, bool overwrite = false, uint parallel_thread_num = 1);
// returns error message (resource allocated), or NULL if no error
char* error_as_C_string() const;
static void dump_heap() NOT_SERVICES_RETURN;
static void dump_heap_from_oome() NOT_SERVICES_RETURN;
};
#endif // SHARE_SERVICES_HEAPDUMPER_HPP
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